collaborativePlatform/CollaborativePlatformMain/Form/MessageSubPage/SeconMessagePage.xaml

<Page x:Class="CollaborativePlatformMain.Form.MessageSubPage.SeconMessagePage"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:CollaborativePlatformMain.Form.MessageSubPage"
        mc:Ignorable="d"
        Title="SeconMessagePage" Width="663" Height="430"
        Loaded="Window_Loaded">
    <DockPanel>

        <!--中间-->
        <StackPanel Height="430">

            <DockPanel Margin="0 0 0 0" Name="sp_hzNavigation" Width="180" Height="30" 
                       HorizontalAlignment="Left" >
                <Menu>
                    <MenuItem Header="通知公告" Click="me_announcementClick" />
                    <MenuItem Header="项目" Click="me_projectClick" />
                    <MenuItem Header="系统" Click="me_systemClick" />
                </Menu>
            </DockPanel>

            <StackPanel Width="180" Height="400" Background="WhiteSmoke"  Name="me_message">

            </StackPanel>
        </StackPanel>

        <ScrollViewer VerticalScrollBarVisibility="Auto" Height="400" Width="483">
            <StackPanel Margin="10,0,0,0" Name="me_right" HorizontalAlignment="Left"  >

            </StackPanel>
        </ScrollViewer>


    </DockPanel>
</Page>